22f3361e1c
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18525 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
273 lines
11 KiB
C++
273 lines
11 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/buffer.h
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// Purpose: auto buffer classes: buffers which automatically free memory
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 12.04.99
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// RCS-ID: $Id$
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows license
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///////////////////////////////////////////////////////////////////////////////
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// these classes are for private use only for now, they're not documented
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#ifndef _WX_BUFFER_H
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#define _WX_BUFFER_H
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#include "wx/wxchar.h"
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// ----------------------------------------------------------------------------
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// Special classes for (wide) character strings: they use malloc/free instead
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// of new/delete
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// ----------------------------------------------------------------------------
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#define DEFINE_BUFFER(classname, chartype, strdupfunc) \
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class classname \
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{ \
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public: \
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classname(const chartype *str) \
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: m_str(str ? strdupfunc(str) : NULL) \
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{ \
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} \
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\
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classname(size_t len) \
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: m_str((chartype *)malloc((len + 1)*sizeof(chartype))) \
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{ \
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m_str[len] = (chartype)0; \
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} \
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\
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/* no need to check for NULL, free() does it */ \
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~classname() { free(m_str); } \
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\
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/* \
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WARNING: \
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\
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the copy ctor and assignment operators change the passed in object \
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even although it is declared as "const", so: \
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\
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a) it shouldn't be really const \
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b) you shouldn't use it afterwards (or know that it was reset) \
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\
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This is very ugly but is unfortunately needed to make the normal use\
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of classname buffer objects possible and is very similar to what \
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std::auto_ptr<> does (as if it were an excuse...) \
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*/ \
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\
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/* \
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because of the remark above, release() is declared const even if it \
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isn't really const \
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*/ \
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chartype *release() const \
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{ \
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chartype *p = m_str; \
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((classname *)this)->m_str = NULL; \
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return p; \
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} \
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\
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classname(const classname& src) \
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: m_str(src.release()) \
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{ \
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} \
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\
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classname& operator=(const chartype *str) \
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{ \
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free(m_str); \
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m_str = str ? strdupfunc(str) : NULL; \
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return *this; \
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} \
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\
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classname& operator=(const classname& src) \
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{ \
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free(m_str); \
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m_str = src.release(); \
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\
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return *this; \
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} \
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\
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chartype *data() { return m_str; } \
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const chartype *data() const { return m_str; } \
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operator const chartype *() const { return m_str; } \
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chartype operator[](size_t n) const { return m_str[n]; } \
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\
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private: \
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chartype *m_str; \
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}
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DEFINE_BUFFER(wxCharBuffer, char, wxStrdupA);
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#if wxUSE_WCHAR_T
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DEFINE_BUFFER(wxWCharBuffer, wchar_t, wxStrdupW);
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#endif // wxUSE_WCHAR_T
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#undef DEFINE_BUFFER
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#if wxUSE_UNICODE
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#define wxMB2WXbuf wxWCharBuffer
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#define wxWX2MBbuf wxCharBuffer
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#define wxWC2WXbuf wxChar*
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#define wxWX2WCbuf wxChar*
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#else // ANSI
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#define wxMB2WXbuf wxChar*
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#define wxWX2MBbuf wxChar*
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#define wxWC2WXbuf wxCharBuffer
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#define wxWX2WCbuf wxWCharBuffer
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#endif // Unicode/ANSI
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// ----------------------------------------------------------------------------
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// A class for holding growable data buffers (not necessarily strings)
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// ----------------------------------------------------------------------------
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// This class manages the actual data buffer pointer and is ref-counted.
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class wxMemoryBufferData
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{
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public:
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// the initial size and also the size added by ResizeIfNeeded()
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enum { BLOCK_SIZE = 1024 };
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friend class wxMemoryBuffer;
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// everyting is private as it can only be used by wxMemoryBuffer
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private:
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wxMemoryBufferData(size_t size = wxMemoryBufferData::BLOCK_SIZE)
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: m_data(size ? malloc(size) : NULL), m_size(size), m_len(0), m_ref(0)
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{
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}
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~wxMemoryBufferData() { free(m_data); }
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void ResizeIfNeeded(size_t newSize)
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{
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if (newSize > m_size)
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{
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void *dataOld = m_data;
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m_data = realloc(m_data, newSize + wxMemoryBufferData::BLOCK_SIZE);
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if ( !m_data )
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{
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free(dataOld);
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}
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m_size = newSize + wxMemoryBufferData::BLOCK_SIZE;
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}
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}
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void IncRef() { m_ref += 1; }
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void DecRef()
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{
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m_ref -= 1;
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if (m_ref == 0) // are there no more references?
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delete this;
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}
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// the buffer containing the data
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void *m_data;
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// the size of the buffer
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size_t m_size;
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// the amount of data currently in the buffer
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size_t m_len;
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// the reference count
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size_t m_ref;
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DECLARE_NO_COPY_CLASS(wxMemoryBufferData)
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};
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class wxMemoryBuffer
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{
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public:
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// ctor and dtor
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wxMemoryBuffer(size_t size = wxMemoryBufferData::BLOCK_SIZE)
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{
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m_bufdata = new wxMemoryBufferData(size);
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m_bufdata->IncRef();
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}
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~wxMemoryBuffer() { m_bufdata->DecRef(); }
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// copy and assignment
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wxMemoryBuffer(const wxMemoryBuffer& src)
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: m_bufdata(src.m_bufdata)
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{
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m_bufdata->IncRef();
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}
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wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
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{
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m_bufdata->DecRef();
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m_bufdata = src.m_bufdata;
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m_bufdata->IncRef();
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return *this;
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}
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// Accessors
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void *GetData() const { return m_bufdata->m_data; }
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size_t GetBufSize() const { return m_bufdata->m_size; }
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size_t GetDataLen() const { return m_bufdata->m_len; }
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void SetBufSize(size_t size) { m_bufdata->ResizeIfNeeded(size); }
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void SetDataLen(size_t len)
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{
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wxASSERT(len <= m_bufdata->m_size);
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m_bufdata->m_len = len;
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}
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// Ensure the buffer is big enough and return a pointer to it
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void *GetWriteBuf(size_t sizeNeeded)
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{
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m_bufdata->ResizeIfNeeded(sizeNeeded);
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return m_bufdata->m_data;
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}
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// Update the length after the write
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void UngetWriteBuf(size_t sizeUsed) { SetDataLen(sizeUsed); }
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// Like the above, but appends to the buffer
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void *GetAppendBuf(size_t sizeNeeded)
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{
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m_bufdata->ResizeIfNeeded(m_bufdata->m_len + sizeNeeded);
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return (char*)m_bufdata->m_data + m_bufdata->m_len;
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}
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// Update the length after the append
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void UngetAppendBuf(size_t sizeUsed)
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{
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SetDataLen(m_bufdata->m_len + sizeUsed);
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}
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// Other ways to append to the buffer
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void AppendByte(char data)
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{
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wxCHECK_RET( m_bufdata->m_data, _T("invalid wxMemoryBuffer") );
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m_bufdata->ResizeIfNeeded(m_bufdata->m_len + 1);
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*(((char*)m_bufdata->m_data) + m_bufdata->m_len) = data;
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m_bufdata->m_len += 1;
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}
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void AppendData(void* data, size_t len)
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{
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memcpy(GetAppendBuf(len), data, len);
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UngetAppendBuf(len);
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}
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operator const char *() const { return (const char*)GetData(); }
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private:
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wxMemoryBufferData* m_bufdata;
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};
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// ----------------------------------------------------------------------------
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// template class for any kind of data
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// ----------------------------------------------------------------------------
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// TODO
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#endif // _WX_BUFFER_H
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